Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 220/70-14 | 245/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.13 (663.6) | 26.68 (677.7) | 0.56 (14.1) 2.1% |
| Width inches (mm) | 8.66 (220) | 9.65 (245) | 0.98 (25) 11.4% |
| Circum. inches (mm) | 82.08 (2084.76) | 83.82 (2129.06) | 1.74 (44.3) 2.1% |
| Sidewall Height inches (mm) | 6.06 (154) | 4.34 (110.25) | -1.72 (-43.75) -28.4% |
| Revolutions per mile (km) | 771.96 (479.67) | 755.9 (469.69) | -16.06 (-9.98) -2.1% |
245/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.42 mph (32.87 km/h) |
| 25 mph (40.23 km/h) | 25.53 mph (41.09 km/h) |
| 30 mph (48.28 km/h) | 30.64 mph (49.31 km/h) |
| 35 mph (56.33 km/h) | 35.74 mph (57.52 km/h) |
| 40 mph (64.37 km/h) | 40.85 mph (65.74 km/h) |
| 45 mph (72.42 km/h) | 45.96 mph (73.96 km/h) |
| 50 mph (80.47 km/h) | 51.06 mph (82.18 km/h) |
| 55 mph (88.51 km/h) | 56.17 mph (90.39 km/h) |
| 60 mph (96.56 km/h) | 61.27 mph (98.61 km/h) |
| 65 mph (104.61 km/h) | 66.38 mph (106.83 km/h) |
| 70 mph (112.65 km/h) | 71.49 mph (115.05 km/h) |
| 75 mph (120.7 km/h) | 76.59 mph (123.27 km/h) |
| 80 mph (128.75 km/h) | 81.7 mph (131.48 km/h) |
| 85 mph (136.79 km/h) | 86.81 mph (139.7 km/h) |
| 90 mph (144.84 km/h) | 91.91 mph (147.92 km/h) |
| 95 mph (152.89 km/h) | 97.02 mph (156.14 km/h) |
| 100 mph (160.93 km/h) | 102.12 mph (164.35 km/h) |
| 2.35 | 2.73 | 2.94 | 3.07 | 3.21 | 3.31 | 3.42 | 3.55 | 3.73 | 3.91 | 4.11 | 4.27 | 4.56 | 4.88 | 5.13 | 5.29 | 5.38 | 5.71 | 6.17 | 7.17 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1924 | 2235 | 2407 | 2513 | 2628 | 2709 | 2799 | 2906 | 3053 | 3201 | 3364 | 3495 | 3733 | 3995 | 4199 | 4330 | 4404 | 4674 | 5050 | 5869 |
Better Fuel Economy Factory Ratios Increased Power
